var wrapper = document.getElementById("signature-pad");
var clearButton = wrapper.querySelector("[data-action=clear]");
var changeColorButton = wrapper.querySelector("[data-action=change-color]");
var undoButton = wrapper.querySelector("[data-action=undo]");
var savePNGButton = wrapper.querySelector("[data-action=save-png]");
// var saveJPGButton = wrapper.querySelector("[data-action=save-jpg]");
// var saveSVGButton = wrapper.querySelector("[data-action=save-svg]");
var canvas = wrapper.querySelector("canvas");
var signaturePad = new SignaturePad(canvas, {
	// It's Necessary to use an opaque color when saving image as JPEG;
	// this option can be omitted if only saving as PNG or SVG
	backgroundColor: 'rgb(255, 255, 255)'
});

// Adjust canvas coordinate space taking into account pixel ratio,
// to make it look crisp on mobile devices.
// This also causes canvas to be cleared.
function resizeCanvas() {
	// When zoomed out to less than 100%, for some very strange reason,
	// some browsers report devicePixelRatio as less than 1
	// and only part of the canvas is cleared then.
	var ratio = Math.max(window.devicePixelRatio || 1, 1);

	// This part causes the canvas to be cleared
	canvas.width = canvas.offsetWidth * ratio;
	canvas.height = canvas.offsetHeight * ratio;
	canvas.getContext("2d").scale(ratio, ratio);

	// This library does not listen for canvas changes, so after the canvas is automatically
	// cleared by the browser, SignaturePad#isEmpty might still return false, even though the
	// canvas looks empty, because the internal data of this library wasn't cleared. To make sure
	// that the state of this library is consistent with visual state of the canvas, you
	// have to clear it manually.
	signaturePad.clear();
}

// On mobile devices it might make more sense to listen to orientation change,
// rather than window resize events.
window.onresize = resizeCanvas;
resizeCanvas();

function download(dataURL, filename) {
	if (navigator.userAgent.indexOf("Safari") > -1 && navigator.userAgent.indexOf("Chrome") === -1) {
		window.open(dataURL);
	} else {
		var blob = dataURLToBlob(dataURL);
		var url = window.URL.createObjectURL(blob);

		var a = document.createElement("a");
		a.style = "display: none";
		a.href = url;
		a.download = filename;

		document.body.appendChild(a);
		a.click();

		window.URL.revokeObjectURL(url);
	}
}

// One could simply use Canvas#toBlob method instead, but it's just to show
// that it can be done using result of SignaturePad#toDataURL.
function dataURLToBlob(dataURL) {
	// Code taken from https://github.com/ebidel/filer.js
	var parts = dataURL.split(';base64,');
	var contentType = parts[0].split(":")[1];
	var raw = window.atob(parts[1]);
	var rawLength = raw.length;
	var uInt8Array = new Uint8Array(rawLength);

	for (var i = 0; i < rawLength; ++i) {
		uInt8Array[i] = raw.charCodeAt(i);
	}

	return new Blob([uInt8Array], {
		type: contentType
	});
}

clearButton.addEventListener("click", function(event) {
	app.saveDisable = false;
	app.submitDisable = true;
	app.saveCan = false;
	signaturePad.clear();
});

undoButton.addEventListener("click", function(event) {
	var data = signaturePad.toData();
	app.saveDisable = false;
	app.submitDisable = true;
	app.saveCan = false;
	if (data) {
		data.pop(); // remove the last dot or line
		signaturePad.fromData(data);
	}
});

changeColorButton.addEventListener("click", function(event) {
	var r = Math.round(Math.random() * 255);
	var g = Math.round(Math.random() * 255);
	var b = Math.round(Math.random() * 255);
	var color = "rgb(" + r + "," + g + "," + b + ")";
	signaturePad.penColor = color;
});

savePNGButton.addEventListener("click", function(event) {
	if (signaturePad.isEmpty()) {
		alert("Please provide a signature first.");
	} else {
		var dataURL = signaturePad.toDataURL();
		app.totalForm.dataUrl = dataURL;
		app.submitDisable = false;
		app.saveDisable = true;
		app.saveCan = true;
		app.showsign = false;
		//download(dataURL, "signature.png");
	}
});

// saveJPGButton.addEventListener("click", function (event) {
//   if (signaturePad.isEmpty()) {
//     alert("Please provide a signature first.");
//   } else {
//     var dataURL = signaturePad.toDataURL("image/jpeg");
//     download(dataURL, "signature.jpg");
//   }
// });

// saveSVGButton.addEventListener("click", function (event) {
//   if (signaturePad.isEmpty()) {
//     alert("Please provide a signature first.");
//   } else {
//     var dataURL = signaturePad.toDataURL('image/svg+xml');
//     download(dataURL, "signature.svg");
//   }
// });
